Steel truss bridge deck slab hoisting construction method under limited clearance condition

Abstract

The invention discloses a steel truss bridge deck slab hoisting construction method under a limited clearance condition. The method fully considers the hoisting of an approach bridge prestressed box girder and the analysis of the clearance in a steel truss, and ensures that the height of a bridge girder erection machine meets the clearance requirement of the steel truss by considering the clearance of the steel truss in the customization process of the bridge girder erection machine and optimizing the structure of the bridge girder erection machine; meanwhile, a scientific hoisting sequence and a scientific hoisting method are adopted, one crown block is arranged inside and outside each steel truss, and a method of effectively switching hoisting of one crown block and combined hoisting of two crown blocks is adopted, so that hoisting of first-span and last-span steel truss bridge panels influenced by the height of a bridge portal is carried out; according to the steel truss bridge deck slab hoisting method, by changing a traditional bridge deck slab hoisting mode, selecting proper hoisting equipment and scientifically converting hoisting sequences, the problems that clearance is insufficient and hoisting difficulty is large when a traditional bridge deck slab is hoisted through a truck crane are effectively solved; and good reference significance is achieved for hoisting of the concrete bridge deck slab of the bridge with clearance condition limitation.

Description

technical field [0001] The invention relates to the technical field of highway bridge construction, in particular to a hoisting construction method for a steel truss bridge deck under the condition of limited headroom. Background technique [0002] In the hoisting construction of the bridge deck of traditional highway bridges, truck cranes and crawler cranes are often used to hoist the bridge deck. Steel truss bridges are hoisted by traditional truck cranes and crawler cranes due to the limitations of steel truss bridge portal frames and upper parallel K-shaped beams. For hoisting, the hoisting space is insufficient, and the steel truss needs to be passed through. The reason is limited and narrow space for hoisting. The hoisting process is easy to cause damage to the installed steel truss and is very dangerous. How to effectively carry out the deck of this kind of steel truss beam bridge , Safe hoisting has become a severe test. Contents of the invention [0003] In order...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the technical problems of insufficient headroom and difficulty in hoisting the traditional bridge deck in the prior art by truck cranes, the present invention provides a construction method for hoisting the deck of a steel truss bridge under the condition of limited headroom. The crown crane adopts the effective conversion method of hoisting of No. 1 crown crane and joint hoisting of No. 2 crown crane to hoist the steel truss bridge deck of the first span and the last span affected by the height of the bridge portal, which solves the above technical problems

Images